Just do this search in google to find out:
info:domainyourchecking.com
If the domain has been forged/spoofed/301'd it will show up by performing this query in G. You see, the domain with the "real" PageRank will ALWAYS be the one to show up in the results.
You could also try this one:
cache:domaintocheck.com
Same rule applies - the domain with the REAL
PR will magically appear (if it is a different domain from your PR8 then it is faked).